Improvement in vent-valves



Patented May 18, 1875 @maw/ou UNITED STATES PATENT OFFICE ANTHONYCHABOT, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT IN VENT-VALVES.

Specilicalion fcrmirg part of Letters Patent No. 163,458, dated May 18,1875; application filed February 25,1875. Y

To all whom t may concern:

Be it known that I, ANTHONY CHABOT, of the city of San Francisco, Stateof California, have invented an Improved Vent-Valve, of which thefollowing is a specification My invention relates to that class ofvalves used on Water mains or pipes to facilitate the drawing off oftheir contents, by forming a vent or opening for the admission of air tosupply the space left by the receding water,

thereby destroying the vacuum which would naturally take place, andprevent the free flow of the water if no vent existed.

Referring to 'the accompanying drawing, Figure l is a sectionalelevation of my iinproved valve; Fig. 2, a plan of saine.

A is the main or pipe through which flows the water, and upon the topot' which is fastened the shell B, either screwed in or held by boltsthrough suitable ilanges. At the side of this shell is a recess orpocket, B', forming a receptacle for the floating spherical valve C whenat rest. This valve is made of rubber, or other suitable material ofless specific gravity than water, such as wood or cork. The top of theshell B is arranged to form a seating for the spherical valve C, whenpushed upward by the water, shown dotted on the drawing.

is a guard-pin to prevent the spherical valve C from falling through tothe lnain, and is placed immediately above the lower angular face of thepocket B', thus guiding the valve to its resting-place. This pin may besubstituted by having an elongation or lip attached to the inside of theshell B in a position to guide the valve to its pocket.

rEhe operation of my valve is as follows: The spherical valve C rests inits pocket until the water in pipe A rises to its level, When it, beingof less gravity, floats up till pushed against the seating on the top ofthe shell B, where it is kept firm by the pressure of the Water. Inemptying the main or pipe A the valve will recede with the Water till,striking the guardpin C', it falls into its pocket, leaving a free andunobstructed `passage for the admission of air into the main.

In a vent or air valve, the spherical oat C, in combination With thepocket B' and guardpin C', substantially as described.

A. CHABOT. Witnesses:

F. E. MONTEVERDE, GEO. PARDY.

